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  <title>primary_key_column_exists (relation_transform.rb)</title>
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  <pre><span class="ruby-comment cmt"># File relation_transform.rb, line 92</span>
 <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">primary_key_column_exists</span>(<span class="ruby-identifier">primary_key</span>,<span class="ruby-identifier">table</span>,<span class="ruby-identifier">new_connection</span>) 
        <span class="ruby-identifier">table_struc</span> = <span class="ruby-identifier">new_connection</span>.<span class="ruby-identifier">query</span>(<span class="ruby-node">&quot;desc #{table}&quot;</span>) 
        <span class="ruby-keyword kw">for</span> <span class="ruby-identifier">field</span> <span class="ruby-keyword kw">in</span> <span class="ruby-identifier">table_struc</span>
                <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">field</span>.<span class="ruby-identifier">join</span>(<span class="ruby-value str">' '</span>).<span class="ruby-identifier">scan</span>(<span class="ruby-value str">'PRIMARY KEY'</span>)
                        <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">field</span>[<span class="ruby-value">0</span>] <span class="ruby-operator">==</span> <span class="ruby-identifier">primary_key</span> 
                                <span class="ruby-keyword kw">return</span> <span class="ruby-value">1</span>
                        <span class="ruby-keyword kw">else</span> 
                                <span class="ruby-keyword kw">return</span> <span class="ruby-value">2</span>
                        <span class="ruby-keyword kw">end</span>          
                <span class="ruby-keyword kw">end</span>   
        <span class="ruby-keyword kw">end</span>
        <span class="ruby-keyword kw">return</span> <span class="ruby-value">3</span>
 <span class="ruby-keyword kw">end</span></pre>
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